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1692
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1 /*
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2 * Copyright (c) 1999, 2007, Oracle and/or its affiliates. All rights reserved.
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3 * Copyright 2009 Red Hat, Inc.
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4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 *
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6 * This code is free software; you can redistribute it and/or modify it
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7 * under the terms of the GNU General Public License version 2 only, as
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8 * published by the Free Software Foundation.
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9 *
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10 * This code is distributed in the hope that it will be useful, but WITHOUT
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11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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13 * version 2 for more details (a copy is included in the LICENSE file that
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14 * accompanied this code).
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15 *
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16 * You should have received a copy of the GNU General Public License version
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17 * 2 along with this work; if not, write to the Free Software Foundation,
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18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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19 *
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20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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21 * or visit www.oracle.com if you need additional information or have any
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22 * questions.
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23 *
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24 */
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25
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26 class SharkCodeBuffer : public StackObj {
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27 public:
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28 SharkCodeBuffer(MacroAssembler* masm)
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29 : _masm(masm), _base_pc(NULL) {}
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30
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31 private:
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32 MacroAssembler* _masm;
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33 llvm::Value* _base_pc;
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34
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35 private:
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36 MacroAssembler* masm() const {
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37 return _masm;
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38 }
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39
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40 public:
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41 llvm::Value* base_pc() const {
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42 return _base_pc;
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43 }
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44 void set_base_pc(llvm::Value* base_pc) {
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45 assert(_base_pc == NULL, "only do this once");
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46 _base_pc = base_pc;
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47 }
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48
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49 // Allocate some space in the buffer and return its address.
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50 // This buffer will have been relocated by the time the method
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51 // is installed, so you can't inline the result in code.
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52 public:
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53 void* malloc(size_t size) const {
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54 masm()->align(BytesPerWord);
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55 void *result = masm()->pc();
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56 masm()->advance(size);
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57 return result;
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58 }
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59
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60 // Create a unique offset in the buffer.
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61 public:
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62 int create_unique_offset() const {
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63 int offset = masm()->offset();
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64 masm()->advance(1);
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65 return offset;
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66 }
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67
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68 // Inline an oop into the buffer and return its offset.
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69 public:
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70 int inline_oop(jobject object) const {
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71 masm()->align(BytesPerWord);
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72 int offset = masm()->offset();
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73 masm()->store_oop(object);
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74 return offset;
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75 }
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76
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77 // Inline a block of non-oop data into the buffer and return its offset.
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78 public:
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79 int inline_data(void *src, size_t size) const {
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80 masm()->align(BytesPerWord);
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81 int offset = masm()->offset();
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82 void *dst = masm()->pc();
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83 masm()->advance(size);
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84 memcpy(dst, src, size);
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85 return offset;
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86 }
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87 };
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